plzz tell me fast......
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your answer is
=>>option (c)
Explanation:
for infinite wire...
B1=(uo/4π)(2i/R). [it is directed towards ..upword direction to the surface of the page]
now for the circular loop ...
B2=(uo/4π)(2πi/R). [it is directed towards .. downward direction to the surface of the page]
therefore net .... magnetic field at o...
B=B2-B1=(uo/2π)(I/R)(π-1)
=[yo(I)/2R][1-1/π]. [it is directed towards .. downward direction to the surface of the page]
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may it help you
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